1 /*
2 * Copyright 2012 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "Test.h"
9 #include "TestClassDef.h"
10 #include "SkBitmap.h"
11 #include "SkCanvas.h"
12 #include "SkDashPathEffect.h"
13 #include "SkSurface.h"
14
create(SkBitmap::Config config,int w,int h,int rb,void * addr=NULL)15 static SkCanvas* create(SkBitmap::Config config, int w, int h, int rb,
16 void* addr = NULL) {
17 SkBitmap bm;
18 bm.setConfig(config, w, h, rb);
19 if (addr) {
20 bm.setPixels(addr);
21 } else {
22 bm.allocPixels();
23 }
24 return new SkCanvas(bm);
25 }
26
new_canvas(int w,int h)27 static SkCanvas* new_canvas(int w, int h) {
28 return create(SkBitmap::kARGB_8888_Config, w, h, 0, NULL);
29 }
30
31 ///////////////////////////////////////////////////////////////////////////////
32
33 // test that we can draw an aa-rect at coordinates > 32K (bigger than fixedpoint)
test_big_aa_rect(skiatest::Reporter * reporter)34 static void test_big_aa_rect(skiatest::Reporter* reporter) {
35 SkBitmap output;
36 SkPMColor pixel[1];
37 output.setConfig(SkBitmap::kARGB_8888_Config, 1, 1, 4);
38 output.setPixels(pixel);
39
40 SkSurface* surf = SkSurface::NewRasterPMColor(300, 33300);
41 SkCanvas* canvas = surf->getCanvas();
42
43 SkRect r = { 0, 33000, 300, 33300 };
44 int x = SkScalarRoundToInt(r.left());
45 int y = SkScalarRoundToInt(r.top());
46
47 // check that the pixel in question starts as transparent (by the surface)
48 if (canvas->readPixels(&output, x, y)) {
49 REPORTER_ASSERT(reporter, 0 == pixel[0]);
50 } else {
51 REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed");
52 }
53
54 SkPaint paint;
55 paint.setAntiAlias(true);
56 paint.setColor(SK_ColorWHITE);
57
58 canvas->drawRect(r, paint);
59
60 // Now check that it is BLACK
61 if (canvas->readPixels(&output, x, y)) {
62 // don't know what swizzling PMColor did, but white should always
63 // appear the same.
64 REPORTER_ASSERT(reporter, 0xFFFFFFFF == pixel[0]);
65 } else {
66 REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed");
67 }
68 surf->unref();
69 }
70
71 ///////////////////////////////////////////////////////////////////////////////
72
moveToH(SkPath * path,const uint32_t raw[])73 static void moveToH(SkPath* path, const uint32_t raw[]) {
74 const float* fptr = (const float*)raw;
75 path->moveTo(fptr[0], fptr[1]);
76 }
77
cubicToH(SkPath * path,const uint32_t raw[])78 static void cubicToH(SkPath* path, const uint32_t raw[]) {
79 const float* fptr = (const float*)raw;
80 path->cubicTo(fptr[0], fptr[1], fptr[2], fptr[3], fptr[4], fptr[5]);
81 }
82
83 // This used to assert, because we performed a cast (int)(pt[0].fX * scale) to
84 // arrive at an int (SkFDot6) rather than calling sk_float_round2int. The assert
85 // was that the initial line-segment produced by the cubic was not monotonically
86 // going down (i.e. the initial DY was negative). By rounding the floats, we get
87 // the more proper result.
88 //
89 // http://code.google.com/p/chromium/issues/detail?id=131181
90 //
91
92 // we're not calling this test anymore; is that for a reason?
93
test_crbug131181()94 static void test_crbug131181() {
95 /*
96 fX = 18.8943768,
97 fY = 129.121277
98 }, {
99 fX = 18.8937435,
100 fY = 129.121689
101 }, {
102 fX = 18.8950119,
103 fY = 129.120422
104 }, {
105 fX = 18.5030727,
106 fY = 129.13121
107 */
108 uint32_t data[] = {
109 0x419727af, 0x43011f0c, 0x41972663, 0x43011f27,
110 0x419728fc, 0x43011ed4, 0x4194064b, 0x43012197
111 };
112
113 SkPath path;
114 moveToH(&path, &data[0]);
115 cubicToH(&path, &data[2]);
116
117 SkAutoTUnref<SkCanvas> canvas(new_canvas(640, 480));
118
119 SkPaint paint;
120 paint.setAntiAlias(true);
121 canvas->drawPath(path, paint);
122 }
123
124 // This used to assert in debug builds (and crash writing bad memory in release)
125 // because we overflowed an intermediate value (B coefficient) setting up our
126 // stepper for the quadratic. Now we bias that value by 1/2 so we don't overflow
test_crbug_140803()127 static void test_crbug_140803() {
128 SkBitmap bm;
129 bm.setConfig(SkBitmap::kARGB_8888_Config, 2700, 30*1024);
130 bm.allocPixels();
131 SkCanvas canvas(bm);
132
133 SkPath path;
134 path.moveTo(2762, 20);
135 path.quadTo(11, 21702, 10, 21706);
136 SkPaint paint;
137 paint.setAntiAlias(true);
138 canvas.drawPath(path, paint);
139 }
140
141 // Need to exercise drawing an inverse-path whose bounds intersect the clip,
142 // but whose edges do not (since its a quad which draws only in the bottom half
143 // of its bounds).
144 // In the debug build, we used to assert in this case, until it was fixed.
145 //
test_inversepathwithclip()146 static void test_inversepathwithclip() {
147 SkPath path;
148
149 path.moveTo(0, SkIntToScalar(20));
150 path.quadTo(SkIntToScalar(10), SkIntToScalar(10),
151 SkIntToScalar(20), SkIntToScalar(20));
152 path.toggleInverseFillType();
153
154 SkPaint paint;
155
156 SkAutoTUnref<SkCanvas> canvas(new_canvas(640, 480));
157 canvas.get()->save();
158 canvas.get()->clipRect(SkRect::MakeWH(SkIntToScalar(19), SkIntToScalar(11)));
159
160 paint.setAntiAlias(false);
161 canvas.get()->drawPath(path, paint);
162 paint.setAntiAlias(true);
163 canvas.get()->drawPath(path, paint);
164
165 canvas.get()->restore();
166
167 // Now do the test again, with the path flipped, so we only draw in the
168 // top half of our bounds, and have the clip intersect our bounds at the
169 // bottom.
170 path.reset(); // preserves our filltype
171 path.moveTo(0, SkIntToScalar(10));
172 path.quadTo(SkIntToScalar(10), SkIntToScalar(20),
173 SkIntToScalar(20), SkIntToScalar(10));
174 canvas.get()->clipRect(SkRect::MakeXYWH(SkIntToScalar(0), SkIntToScalar(19),
175 SkIntToScalar(19), SkIntToScalar(11)));
176
177 paint.setAntiAlias(false);
178 canvas.get()->drawPath(path, paint);
179 paint.setAntiAlias(true);
180 canvas.get()->drawPath(path, paint);
181 }
182
test_bug533()183 static void test_bug533() {
184 #ifdef SK_SCALAR_IS_FLOAT
185 /*
186 http://code.google.com/p/skia/issues/detail?id=533
187 This particular test/bug only applies to the float case, where the
188 coordinates are very large.
189 */
190 SkPath path;
191 path.moveTo(64, 3);
192 path.quadTo(-329936, -100000000, 1153, 330003);
193
194 SkPaint paint;
195 paint.setAntiAlias(true);
196
197 SkAutoTUnref<SkCanvas> canvas(new_canvas(640, 480));
198 canvas.get()->drawPath(path, paint);
199 #endif
200 }
201
test_crbug_140642()202 static void test_crbug_140642() {
203 /*
204 * We used to see this construct, and due to rounding as we accumulated
205 * our length, the loop where we apply the phase would run off the end of
206 * the array, since it relied on just -= each interval value, which did not
207 * behave as "expected". Now the code explicitly checks for walking off the
208 * end of that array.
209
210 * A different (better) fix might be to rewrite dashing to do all of its
211 * length/phase/measure math using double, but this may need to be
212 * coordinated with SkPathMeasure, to be consistent between the two.
213
214 <path stroke="mintcream" stroke-dasharray="27734 35660 2157846850 247"
215 stroke-dashoffset="-248.135982067">
216 */
217
218 #ifdef SK_SCALAR_IS_FLOAT
219 const SkScalar vals[] = { 27734, 35660, 2157846850.0f, 247 };
220 SkDashPathEffect dontAssert(vals, 4, -248.135982067f);
221 #endif
222 }
223
test_crbug_124652()224 static void test_crbug_124652() {
225 #ifdef SK_SCALAR_IS_FLOAT
226 /*
227 http://code.google.com/p/chromium/issues/detail?id=124652
228 This particular test/bug only applies to the float case, where
229 large values can "swamp" small ones.
230 */
231 SkScalar intervals[2] = {837099584, 33450};
232 SkAutoTUnref<SkDashPathEffect> dash(
233 new SkDashPathEffect(intervals, 2, -10, false));
234 #endif
235 }
236
test_bigcubic()237 static void test_bigcubic() {
238 #ifdef SK_SCALAR_IS_FLOAT
239 SkPath path;
240 path.moveTo(64, 3);
241 path.cubicTo(-329936, -100000000, -329936, 100000000, 1153, 330003);
242
243 SkPaint paint;
244 paint.setAntiAlias(true);
245
246 SkAutoTUnref<SkCanvas> canvas(new_canvas(640, 480));
247 canvas.get()->drawPath(path, paint);
248 #endif
249 }
250
251 // we used to assert if the bounds of the device (clip) was larger than 32K
252 // even when the path itself was smaller. We just draw and hope in the debug
253 // version to not assert.
test_giantaa()254 static void test_giantaa() {
255 const int W = 400;
256 const int H = 400;
257 SkAutoTUnref<SkCanvas> canvas(new_canvas(33000, 10));
258 canvas.get()->clear(SK_ColorTRANSPARENT);
259
260 SkPaint paint;
261 paint.setAntiAlias(true);
262 SkPath path;
263 path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
264 canvas.get()->drawPath(path, paint);
265 }
266
267 // Extremely large path_length/dash_length ratios may cause infinite looping
268 // in SkDashPathEffect::filterPath() due to single precision rounding.
269 // The test is quite expensive, but it should get much faster after the fix
270 // for http://crbug.com/165432 goes in.
test_infinite_dash(skiatest::Reporter * reporter)271 static void test_infinite_dash(skiatest::Reporter* reporter) {
272 SkPath path;
273 path.moveTo(0, 0);
274 path.lineTo(5000000, 0);
275
276 SkScalar intervals[] = { 0.2f, 0.2f };
277 SkDashPathEffect dash(intervals, 2, 0);
278
279 SkPath filteredPath;
280 SkPaint paint;
281 paint.setStyle(SkPaint::kStroke_Style);
282 paint.setPathEffect(&dash);
283
284 paint.getFillPath(path, &filteredPath);
285 // If we reach this, we passed.
286 REPORTER_ASSERT(reporter, true);
287 }
288
289 // http://crbug.com/165432
290 // Limit extreme dash path effects to avoid exhausting the system memory.
test_crbug_165432(skiatest::Reporter * reporter)291 static void test_crbug_165432(skiatest::Reporter* reporter) {
292 SkPath path;
293 path.moveTo(0, 0);
294 path.lineTo(10000000, 0);
295
296 SkScalar intervals[] = { 0.5f, 0.5f };
297 SkDashPathEffect dash(intervals, 2, 0);
298
299 SkPaint paint;
300 paint.setStyle(SkPaint::kStroke_Style);
301 paint.setPathEffect(&dash);
302
303 SkPath filteredPath;
304 SkStrokeRec rec(paint);
305 REPORTER_ASSERT(reporter, !dash.filterPath(&filteredPath, path, &rec, NULL));
306 REPORTER_ASSERT(reporter, filteredPath.isEmpty());
307 }
308
DEF_TEST(DrawPath,reporter)309 DEF_TEST(DrawPath, reporter) {
310 test_giantaa();
311 test_bug533();
312 test_bigcubic();
313 test_crbug_124652();
314 test_crbug_140642();
315 test_crbug_140803();
316 test_inversepathwithclip();
317 // why?
318 if (false) test_crbug131181();
319 test_infinite_dash(reporter);
320 test_crbug_165432(reporter);
321 test_big_aa_rect(reporter);
322 }
323